public void Init(byte[] H)
{
if (M == null)
{
M = new uint[16][][];
}
else if (Arrays.AreEqual(this.H, H))
{
return;
}
this.H = Arrays.Clone(H);
M[0] = new uint[256][];
M[0][0] = new uint[4];
M[0][128] = GcmUtilities.AsUints(H);
for (int j = 64; j >= 1; j >>= 1)
{
uint[] tmp = (uint[])M[0][j + j].Clone();
GcmUtilities.MultiplyP(tmp);
M[0][j] = tmp;
}
for (int i = 0; ;)
{
for (int j = 2; j < 256; j += j)
{
for (int k = 1; k < j; ++k)
{
uint[] tmp = (uint[])M[i][j].Clone();
GcmUtilities.Xor(tmp, M[i][k]);
M[i][j + k] = tmp;
}
}
if (++i == 16)
{
return;
}
M[i] = new uint[256][];
M[i][0] = new uint[4];
for (int j = 128; j > 0; j >>= 1)
{
uint[] tmp = (uint[])M[i - 1][j].Clone();
GcmUtilities.MultiplyP8(tmp);
M[i][j] = tmp;
}
}
}
